Handling leap year is fairly straightforward—add an extra day, if using the Gregorian calendar, to the year-month or day interval calculations.

处理闰年相当简单——如果使用公历，在以年月日为时间间隔的计算中添加额外的一天。

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In most cases, use the Gregorian calendar.

在大多数情况下，使用罗马日历。

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It falls around April 5 of the Gregorian calendar.

它是在阳历四月五号前后。

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We controlled for other well-known fixed calendar (we call them Gregorian anomalies), notably,day of the week effect, like Monday,January effect, Halloween effect, and none of those factors explained results.

VOA: standard.2010.08.05

The Gregorian calendar is used today in the large majority of countries.

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Clavius started his career by taking on the reform of the Gregorian calendar, a project partly inspired by Copernicus and his book.

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The next day would be February 14 under the Gregorian system, the dates in between being scrapped to correct the difference between the two.

CNN: Saturday,